Door latch and lock.



PATENTED MAY 8, 19'06.

G. A. LINDSTRM.

DOOR LATCH AND LOCK.

APPLICATION FILED APR.6. 1905.

2 SHEETS-SHEET 1 WITNESSES A TTOHNEYS oor M nu R T S D N I L A. G.

DOOR LATCH AND LOCK.

APPLICATION FILED APR.6. 1905.

2 SHEETS-SHEET 2.

,m M. WA fw ,4 TTUR/VEYS amm. cu. woraumoanwueas. msummon. n c.

UNITED STATES PATENT OFFICE.

GUsTAF A.' LINDsTRoM, on sTAMFoRD, CONNECTICUT.

" DOOR LATCHAND. LOCK.

Specification vof Letters Patent.

Application led April', 19O5. SerialNo. 254,071.

To all ufl/1,0m it may concern: f

Be it known that I, GUsTAF A, LINDsTRM, a subject of the King of Sweden and Norway,

`residing at Stamford, :inthe county of Fairfield and State of Connecticut, have inventedt certain new and useful Improvements in" Door Latches and Locks, of which the follow'- I ing is a speciiication, such as willl enable those# operated by a-detached keyfromi the outerff side of the door, the permanent key on the inner side of the doorbeing alsoadapted to serve as means for preventing the unlocking of the door from the outer side thereof when desired, a further object being to provide a device of the class described having a singlev bolt which operates both as a lock'and as a latch bolt, and with these and other objectsin view the invention consistsiin a combined latch and lock of the class speciiied constructed as hereinafter described and claimed.

The invention is fully disclosed inthe following specification, of which the accompanying drawings form a part, iny which the separate parts of my improvement are 'desig- `nated by suitable reference-*characters in each of the views, and in which- Figure l is an inside sectional view of myimproved combined lat-ch and lock and showing the same mountedin a door, together with a portion of the door-frame, and showing the latch and lock bolt in position for locking the door, the tumblers being indicated iin,y dotted ylinesgFig. 2, a viewfrsimilar to Fig. :1,'but

l showing the latch and lock bolt inthe position it occupies when serving as a latch g Fi 3, a similar viewl showing the latch and loc v bolt withdrawn for the purpose of kopening the door and showingthe tumblers i-n the position they occupy at such time and in full lines; Fig. 4, a section o'n the'line 4: @of Fig. 2 and showing the tumblers in ifull lines; `Fig'.5, a section onvtheline 55 of `Fig..2 andv showing the method of operating -the detached1 key from the outer side of the" door; fFig. 16, al view similar to Fig. 5, but showing the method of operating the permanent key from the-inside kof-thedoorj Fig. 7,'a section on vtheline 7 7 of Fig. 5, Aand-Fig;l S aside view of a tumbler whichfI employ.

Inlthe drawingsforming partofthis specification, reference Vbeingma'detofFigs.4 l to 4,

inclusive', Ihave showniat a a'partfof a door 'and at b' a part of ay door-frame, and in the practice'of myinventionl provide alock-casing c,which is'adapted to be secured in the door lin the 'usual manner andin which is mounted va boltd, which isi-preferably flat and rectangular in cross-sectionl and-provided'with -the fusual head d2, adapted 'to be projected #through the face-plate czof the lock-casing c inthe usualy lmanner and to enterlthe usual socket .or recess Z22 in the frame of -the door.

One side of thecasing c, fthe-inner side, is re-y movable,= and the-'headclz is thicker than the main portion ofthebolt d, and this construction forms a) transverse shoulder d3, against which bears al spring df,-which is connected withY apost d5, secured to the permanent side of the casing c, andthe main partof the bolt d is provided with ay longitudinal slot'or opening d6, through whichlpasses a pin (Z7, secured `in lthe casing, and which forms al guide for the bolt r`0l,fand` another pin d8 is also secured to one side of the casing c, which also passes -through the slot d6, land the pins Z7 and d8,

which are arranged in a horizontal line, compel the bolt d to move in a straight'horizontal-line in theoperation thereof. lThe inner end portion ofthe bolt d is also provided with ahorizontal post @,'and secured inithe inner end portion of the-casing c is a post e2, and the bolt d is provided inthe Vbottom thereof and near the inner endwith a segmental recess e, having anangular extension e4, and

tadjacent tothe recess "es and between the same andfthe head-d2 vof saidfbolt is another 'recess e5 in'- the bottom of said bolt, and' the recesses des andl e5 for-m a Vdownwardly-directed proj ection e", whichis' concave on its inner side andconvexon its outerside "Lying `iiat onl `the inner side oftheboltdand-turnably-'mounted on the pin ldlfare tumblers f, three of which areemployedin'theform of construction shown,fand said tumblers are iiat and oblong -i-n form, and secured in ythe 'bottom of eachI of said tumblersis a spring f 2,

and the springs f2 arefcarriedaround the heads of the tumblers fand formed into spring-arms f3, which'vare connectedv with or placed' against a post 1, secured to Yth'eback or permanent side ofthe casing c.

A side view of one of the tumblers f is given in Fig. 8, and said tumblers are wider at their free ends than at their pivoted ends, and all of said tumblers are of the same form and construction, except as hereinafter described. Each of said tumblers is provided near the middle thereof with a transverse opening g, between which and the free end of the tumbler is another transverse opening g2, and these openings are placed in communication by a horizontal opening g3, and a longitudinal slot or opening g4 extends from the upper end of the transverse opening g2 to the free end of the tumbler, and this forms a top finger g5 and a bottom jaw g, and the only difference in the tumblers is in the fact that the jaw g6 of the middle tumbler is wider than the jaw g6 of the outer tumbler and the aw g6 of the inner tumbler is wider than the jaw g6 of the middle tumbler.

In the operation of the latch and lock-bolt d the iingers g5 of the tumblers g bear on the post e2, which is secured in the casing, and the post e, which is on the inner end of the latch and lock bolt d, operates in the longitudinal slots or openings g4 in the tumblers f and in the openings g, g2, and g3, and said tumblers remain stationary7 or, in other words, they have no longitudinal movement, but do have a vertical movement, and the inner -end of the latch and lock bolt d is provided with a recess h, which the post enters when the latch and lock bolt d is at the limit of its inward movement.

When the latch and lock bolt d is at the limit of its outward movement when serving as a lock-bolt, as shown in Fig. 1, the spring d* bears on a post h2 in the lock-casing, and when said latch and lock bolt is in its inward position the said spring bears on the transv erse shoulder d3 at the inner end of the head of said bolt.

In Fig. 5 I have shown the permanent key by which the lock is operated from the inner side ofthe door, and also the detached key by which it may be operated from the outer side of the door, and the permanent key consists of a tubular casing i, in which is mounted a longitudinally-movable key-stem i2, provided at its linner end with a key-bit i3, which passes through a longitudinal slot 'i4 in the bottom of the tubular casing i. The outer end of the key-stem i2 is provided with a knob i5, preferably similar to an ordinary doorknob, and in practice the tubular casin i is passed through the inner side portion of the door 'and is secured in a hole i in the inner or detachable side of the lock-casing, and the hole i is provided with a downwardly-directed extension i7, and said holes t and i? form in connection an ordinary keyhole. Mounted in the tubular casing Q', is a spiral spring i8, through which the key-stem i2 passes, and said stem is provided with a collar i9, against which the spring is bears, and

i5 of the key-stem, and the recess forms two i projecting portions ja and jt The detached key consists of a stem lc, having a bit k2, and the bit k2 is provided with a radial recess 7c3, on the outer side of which is a shoulder c4, and the recess 7c3 forms two projecting portions c and k6, and it will be seen that lthe bits of the separate keys are exactly the same except that the parts of said bits are reversed.

The normal position of the latch and lock bolt is that shown in Fig. 2, in which said bolt serves as a latch, and with the parts in this position if. it is desired to lock the door from the inside the stemi2 of the permanent key is forced inwardly and turned to the left. In this operation the part js of the bit i3 strikes the downwardly-directed projection es on the latch and lock bolt d and forces it outwardly, and at the same time the tumblers are raised, the bottom of the inner tumb er striking the bottom of the recess y', while the bottom of the middle tumbler strikes the shoulder jg, and the bottom of the outer tumbler strikes the projection j* of the key-bit i3, and in this operation the post e is drawn outwardly through the horizontal openings g3 into the transverse openings g, and said tumblers are forced downwardly by the spring-armsj13 into the position shown in dotted lines in Fig. l, and the post e is in the top portion of the transverse openings g in said tumblers and the latch and lock bolt is locked in its projected position. When it .is desired to unlock the door, the bit t3 of the key-stem i2 is inserted in the same manner and turned to the right, and the operation is exactly the reverse oi' that above described, the tumblers' being raised and the latch and lock bolt being forced inwardly to the limit of its inward movement, in which position the tumblers dropdown and the post e is in the top portion of the transverse openingsg2 in said tumblers.

It will be understood from Fig. 5 that in unlocking the door from the outer side the operation is thesame as that hereinabove described except that the detached key is used. In this operation the stem i2 of the permanent key is fully withdrawn from the lockcasing and the detached key is inserted and operated in the usual manner.

IOO

IIO

When the permanent key or the stem and bit thereof are in the lock-casing, as shown in Fig. 6, it will be apparent that the detached key cannot be used from the outer side of the door, and all that is necessary to prevent the door from being unlocked from the outside thereof is to leavethe permanent key,or the stem and bit thereof,.inthe lock-casing, and

in order to do this it is'only` necessary to turn the bit 'i3 at right angles tothe keyhole or 1 lar number-olil the tumblersf, and any desired number of said tumblers may be employed,

. all that is necessary in this connection being which are formed to correspond with the numl ployedin a lockiorlatch and lock havingbut close without o erating either key; but in. Aorder to open t 'e door a key fmust be emdoor, takes the place oian ordinary door-y to employ akey or .keys the bit or bits yof ber of the tumblers employed, and itwill be apparent that my improvement may be. em-

one tumbler of the form herein shown and described, if desired.

By this construction I provide .a combined latch and lock having a single bolt which serves both as latch-bolt and a *lock-boltwhen necessary, and when the parts are in the position shown inFig. 2 the-.device will operate as an ordinary latch and they door willy ployed, and in ractice the knob L5 ofthe ermane'nt key, W 'ch is on the inner side o the knob, and the door maybe opened and closed thereby@ It will also be seen that my improved combined latch and` lockV does not employ lthe usual spindle and knobs, and the construction andoperation is therefore much.

simplified and less, expensive. It will also be seen that when the boltI d is in position to serve as a latch-bolt, asin Figs. l and 2, it is not projected as far as when it is used as a lock-bolt, as shown in Fig. l1, and in the latter position the spring dtis not in use, andthe projection of the bolt beyond `the position shown in Fig. 2 results Jfrom the construction .ofthe `inner 'end of the boltfand of the tumblers, as hereinbefore described, and from the iorm of the keys employed or the bits of said reys. j

Although I have described the key which is permanently connected with one side of the casing c as consisting of the tubular casing i, the stem i2, provided with the bit '113, and the knob i5, it will be apparent that the tubular casing i serves as a means onlyfor connecting the permanent key with the casing, and said permanent key consists of the stem i2, having the bit i3 and the knob i5, and this key is normally projected so that the bit i3 is outside of the casing c by means of the spring is.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is* v 1. A door latch and lock, comprising a casing, a spring-projected bolt mounted therein and adapted to serve as a latch-bolt, tumblers operating in connection with said bolt, a key-knob connected with one side of the casing and movable toward and from the casing, a key connected: with said knob and adapted to-operate in connection with said bolt and said tumblers and the turning of which4 in one direction willwithdraw the bolt ywhen serving as a latch-bolt and the turning otuwhich in the opposite directionfwill project said boltto serve as a lock-bolt.

2. A door-latch and lock, comprising a casing, ka spring-projected bolt mounted therein ,and adapted to serve as a latch-bolt, springoperated tumblers operating in connection with said bolt, al knob connected with one side of said casing and movable toward and from said casing,.a=key-stem connected with lsaidknob and provided with a bit adapted to be inserted into the casing, and the turning of which in one direction willwithdraw `the Ibolt when serving as a latch-bolt, said bolt and saidftumblers being also provided `with means whereby the turning ofsaid knob and the key-bit connected therewith in one -direction will project said bolt and lock it in its projected position, and-in the opposite direction will withdraw said bolt.

3. yA combined latch and lock, comprising a casing provided with a bolt adapted to serve` both as a latch and lock bolt, a spring for projecting said bolt to serve as a latchbolt, pivoted spring-operated tumblers at one side of said bolt, and means whereby the tum- 4and locked in the projected position by different keys inserted from the opposite sides 'of the casing, one of said keys being permanentlyy connected with said casing and being .provided with a knob-handle.

4. A door latch and lock, comprising a casing, a bolt mounted therein and adapted to serve both as a latch and lock bolt, a spring for projecting said bolt to serve as a latchbolt, tumblers operating in connection with said bolt, a knob connected with one`side of the casing and movable toward and from the casingand provided with avkey stem andbit adapted to be inserted into said casing, said bit being adapted to operate said tumblers and said bolt so as to project said bolt and lock it in its projected position, and to withdraw said bolt, said key stem and bit being also adapted to prevent the insertion of a key from the opposite side ofthe door.

5. A door latch and lock, comprising a casing, a bolt mounted therein, a spring for proj ecting said bolt to serve as a latch-bolt, tumblers in operative connection with said bolt, a knob connected with one side of said casing and movable toward and from said casing, means for moving said knob from said casing, and a key stem and bit connected with said knob and operating in connection with said tumblers and said bolt to withdraw said bolt when serving as a latch-bolt, and to project said bolt beyond its latch-bolt position to serve as a lock-bolt, said bolt and said tumblers being also adapted to be operated by an IOO ISO

95 blers may be operated and the bolt projected serve as a latch-bolt, pivoted and spring-de pressed tumblers operating in connection with said bolt, a permanent key connected with one side of said casing and movable toward and from said casing and provided with a bit adapted to be inserted into said casing and to operate in connection with said tumblers and said bolt, said bit and said tumblers and said bolt being rovided with means whereby the turning o said key in one direc* tion will withdraw the bolt when serving as a latch-bolt, and in the opposite direction will project said bolt into its lock-bolt position and lock it in said position and the turning of which again in the opposite direction will withdraw saidv bolt from its lock-bolt position and leave it free to serve as a latch-bolt.

'7. A combined latch and lock for doors, comprising a casing, a bolt mounted therein and adapted to serve both as a latchand lock bolt, means for normally projecting said bolt to serve as a latch-bolt, a pivoted spring-held tumbler mounted in connection with said bolt, a permanent key connected with one side of said casing and movable toward and from the same and provided with a bit adapted to be insertedin said casing and to operate in connection with said bolt and said tum bler, said bolt and said tumbler being provided with means whereby the turning of said key in one direction will Withdraw said bolt 'from its latch-bolt position and in the oppo site direction will project said bolt into its lock-bolt position and lock it in such position, and the turning of which again in the opposite direction will unlock and withdraw said bolt, substantially as shown and described.

8. A combined latch and lock for doors, comprising a casing, a bolt mounted therein and adapted to serve both as a latch and lock bolt, a spring for projecting said bolt to serve as a .latch-bolt, a key permanently connected with one side of said casing and movable toward and from said casing and adapted to be inserted thereinto, and means whereby the turning of said key in one direction will withdraw the bolt from its latch-bolt position and in the opposite direction will project said bolt into its lock-bolt position and lock it in such position, and the turning of which again in the opposite direction will unlock said bolt and withdraw it from its lock-bolt position, substantially as shown and described.

9. A combined latch and lock for doors, comprising a casing, a bolt mounted therein and adapted to serve both as a latch and lock bolt, a s ring for projecting said bolt to serve as a latc -bolt, a key permanently connected with one side of said casing and movable toward and from said casing and adapted to be inserted thereinto, and means whereby the turning of said key in one direction will withdraw the bolt from its latch-bolt position and in the opposite direction will project said bolt into its lock-bolt position and lock it in such position, and the turning of which again in the opposite direction will unlock said bolt and withdraw it from its lock-bolt position, said bolt being also adapted to be operated by an independent key inserted from the opposite side of the casing, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 5th day of April, 1905.

GUSTAF A. LIN DSTRM.

Witnesses F. A. STEWART, C. E. MULREANY. 

